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| 伸缩套管式天线杆 | |||
| 套管式天线杆 | |||
| 伸缩式轻便井架 | |||
| 伸缩套管桅 | |||
| 套管天线杆; 伸缩柱; 伸缩套管式天线; 伸缩式钻塔; 伸缩式桅杆 | |||
| 可伸缩的天线杆 | |||
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| 伸缩桅 | |||
| telescopic mast: 4 phrases in 3 subjects |
| Drilling | 1 |
| Engineering geology | 1 |
| Technology | 2 |
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